If you want to post an image or photo to the forum you can upload it to an image hosting site and then use "bbcode" to embed it into your post. A simple to use image hosting site is imgur.com (but there are many others). The process is simple:
Drag your image onto the imgur webpage and then click the Start Upload button which will appear.
Wait for the upload to complete...
Click the Large Thumbnail link and then copy the text under Linked BBCode (message boards) (hint: you can just click the file icon next to the text)
Paste that text into your Talk Porty post
Submit, And you have an image in your post!